Tornado Watch 128

Issued

Apr 11, 2011, 10:31 AM CDT (15:31 UTC)

Expired

Apr 11, 2011, 5:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

70 kt

The Memphis radar (KNQA), 66 km from the middle of the area, began a volume at 15:31 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 409Apr 11, 8:58 AM CDT
• Mesoscale Discussion 410Apr 11, 9:46 AM CDT
• Mesoscale Discussion 411Apr 11, 10:41 AM CDT
• Mesoscale Discussion 413Apr 11, 12:37 PM CDT
• Mesoscale Discussion 415Apr 11, 3:56 PM CDT

086 
WWUS20 KWNS 111533
SEL8
SPC WW 111533
ARZ000-KYZ000-MSZ000-TNZ000-112200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 128
NWS STORM PREDICTION CENTER NORMAN OK
1030 AM CDT MON APR 11 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       PARTS OF EASTERN ARKANSAS
       PARTS OF SOUTH CENTRAL KENTUCKY
       MUCH OF NORTHERN MISSISSIPPI
       PARTS OF CENTRAL AND MIDDLE TENNESSEE

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1030 AM UNTIL
500 PM CDT.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHEAST OF
MONTICELLO ARKANSAS TO 60 MILES EAST NORTHEAST OF BOWLING GREEN
KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

DISCUSSION...STRONG S/WV TROUGH AND ASSOCIATED WIND FIELD ROTATING
EWD ACROSS LWR MS VALLEY THIS AFTERNOON DEVELOPING A SURFACE WAVE ON
FRONTAL ZONE SRN AR.  STRONG HEATING WILL INCREASE INSTABILITY EWD
AHEAD OF ONGOING CONVECTION ACROSS THE WATCH.  THUNDERSTORMS
INCREASING ACROSS CENTRAL SRN AR WILL MOVE RAPIDLY NEWD AHEAD OF THE
SURFACE LOW WITH AN ENHANCED WIND PROFILE SUPPORTING BOTH DAMAGING
WINDS AND POSSIBLE TORNADOES THRU THE AFTERNOON.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24040.


...HALES

Tornado Watches in Tennessee, 2011Tornado Watches in Kentucky, 2011Tornado Watches in Mississippi, 2011Every tornado watch in 2011

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.